Combined cycle power device

ABSTRACT

The combined cycle power device of the present invention belongs to the field of energy and power technology. A combined cycle power device comprises an expander, a compressor, a second expander, a pump, a high-temperature heat exchanger, a condenser and an evaporator. A condenser has a liquid refrigerant pipe which passes through a pump and connects the evaporator. An evaporator connects a high-temperature heat exchanger. The high-temperature heat exchanger has a vapor channel connected a compressor. The compressor has a low-pressure vapor channel connected the evaporator. The evaporator connects the compressor and the second expander respectively. The second expander connects the condenser. The high-temperature heat exchanger connects the outside. The condenser has the cooling medium channel connected the outside. The evaporator has the heat source medium channel connected the outside. The expander and the second the expander connect the compressor and transmit power.

FIELD

The present invention belongs to the flied of energy and power technology.

BACKGROUND

Cold demand, heat demand and power demand are common in human life and production. It is an important way to obtain and provide power by the conversion of thermal energy into mechanical energy. In general, the temperature of heat source reduces and varies with the release of heat. When fossil fuels are used as the primary energy, the heat source has the dual characteristics of both high-temperature and variable temperature. This makes it is difficult to transform more heat energy into mechanical energy using the power device based on a single thermal cycle. For high-quality fuel, the traditional gas-steam combined cycle can be used to obtain a high thermal efficiency. However, there are still some problems to be solved, such as high cost, large investment and low thermal efficiency to be improved.

Take the vapor power device with the outside combustion for example, its heat source has the dual characteristics of high-temperature and variable temperature. For those vapor power devices based on the Rankine cycle, the material's temperature resistance and pressure resistance abilities and safety concerns limit the parameters of the cycle's working medium. Therefore, there is a big temperature difference between the working medium and the heat source, which leads to big irreversible loss and low efficiency. This means that there is great potential to improve the thermal efficiency.

Humans need to use heat energy simply, actively, efficiently for achieving power. Therefore, the present invention provides a combined cycle power device with high thermal efficiency, strong safety, adaptation to high-temperature heat source or variable temperature heat source and response to various fuels.

THE CONTENTS OF THE PRESENT INVENTION

The combined cycle power device are mainly provided in the present invention, and the specific contents of the present invention are as follows:

-   -   1. A combined cycle power device comprises an expander, a         compressor, a second expander, a pump, a high-temperature heat         exchanger, a condenser and an evaporator. A condenser has a         liquid refrigerant pipe which passes through a pump and connects         the evaporator, an evaporator has a vapor channel connected a         high-temperature heat exchanger, a compresso has a vapor channel         connected the high-temperature heat exchanger, the         high-temperature heat exchanger has a vapor channel connected an         expander, the expander has a low-pressure vapor channel         connected the evaporator, an evaporator has a low-pressure vapor         channel connected the compressor and the second expander         respectively, the second expander has a low-pressure vapor         channel connected the condenser. The high-temperature heat         exchanger has the heat source medium channel connected the         outside, the condenser has the cooling medium channel connected         the outside, the evaporator has the heat source medium channel         connected the outside, the expander and the second the expander         connect the compressor and transmit power. The expander and the         second expander connects the compressor and the pump and         transmit power if necessary.     -   2. A combined cycle power device comprises an expander, a         compressor, a second expander, a pump, a high-temperature heat         exchanger, a condenser, an evaporator and a heating unit. A         condenser has a liquid refrigerant pipe which passes through a         pump and connects the evaporator, an evaporator has a vapor         channel connected a high-temperature heat exchanger, a         compressor has a vapor channel connected the high-temperature         heat exchanger, the high-temperature heat exchanger has a vapor         channel connected an expander, an expander has a low-pressure         vapor channel connected the heating unit, the heating unit has a         low-pressure vapor channel connected the compressor and the         second expander respectively, the second expander has a         low-pressure vapor channel connected the condenser. The         high-temperature heat exchanger has the heat source medium         connected the outside, the condenser has the cooling medium         channel connected the outside, the evaporator has the heat         source medium channel connected the outside, the heating unit         has the heated medium channel connected the outside, the         expander and the second the expander connect the compressor and         transmit power. The expander and the second expander connects         the compressor and the pump and transmit power if necessary.     -   3. A combined cycle power device comprises an expander, a         compressor, a second expander, a pump, a high-temperature heat         exchanger, a condenser, an evaporator and a high-temperature         regenerator. An condenser has a liquid refrigerant pipe which         passes through a pump and connects the evaporator, an evaporator         has a low-pressure vapor channel which passes through a         high-temperature regenerator and connects the high-temperature         heat exchanger, a compressor has a vapor channel which passes         through the high-temperature regenerator and connects the         high-temperature heat exchanger, the high-temperature heat         exchanger has a vapor channel connected the expander, the         expander has a low-pressure vapor channel connected the         high-temperature regenerator, the high-temperature regenerator         has the heat source medium connected the evaporator, an         evaporator has a low-pressure vapor channel connected the         compressor and the second expander respectively, the second         expander has a low-pressure vapor channel connected the         condenser. The high-temperature heat exchanger has the heat         source medium channels connected the outside, the condenser has         the cooling medium channel connected the outside, the evaporator         has the heat source medium channel connected the outside, the         expander (1) and the second the expander (3) connect the         compressor and transmit power. The expander and the second         expander connects the compressor and the pump and transmit power         if necessary.     -   4. A combined cycle power device comprises an expander, a         compressor, a second expander, a pump, a high-temperature heat         exchanger, a condenser, an evaporator and the second         high-temperature heat exchanger. The condenser has a liquid         refrigerant pipe which passes through a pump and connects the         evaporator, an evaporator has a vapor channel connects the         second high-temperature heat exchange, the second         high-temperature heat exchanger has a vapor channel connects an         expander, a compressor has a vapor channel connects the         high-temperature heat exchanger, the high-temperature heat         exchanger has a vapor channel which passes through a         intermediate vapor inlet channel and connects the expander, the         expander has a low-pressure vapor channel connected the         evaporator, the evaporator has a low-pressure vapor channel         connected the compressor and a second expander respectively, the         second expander has a low-pressure vapor channel connected the         condenser. The high-temperature heat exchanger and the second         high-temperature heat exchanger have the heat source medium         channels connected the outside, the condenser has the cooling         medium channel connected the outside, the evaporator has the         heat source medium channel connected the outside if necessary,         the expander and the second expander connect the compressor and         transmit power. The expander and the second expander connect the         compressor and the pump and transmit power if necessary.     -   5. A combined cycle power device comprises an expander, a         compressor, a second expander, a pump, a high-temperature heat         exchanger, a condenser and an evaporator. The condenser has a         liquid refrigerant pipe which passes through a pump and connects         the evaporator, an evaporator has a vapor channel which passes         through a intermediate vapor inlet channel and connects an         expander, a compressor has a vapor channel which passes through         a high-temperature heat exchanger and connects the expander, the         expander has a low-pressure vapor channel connected the         evaporator, the evaporator has a low-pressure vapor channel         connected the compressor and the second expander respectively,         the second expander has a low-pressure vapor channel connected         the condenser. The high-temperature heat exchanger has the heat         source medium channel connected the outside, the condenser has         the cooling medium channel connected the outside, the evaporator         has the heat source medium channel connected the outside if         necessary, the expander and the second expander connect the         second compressor and transmit power. The expander and the         second expander connect the compressor and the pump and transmit         power if necessary.     -   6. A combined cycle power device comprises an expander, a         compressor, a second expander, a pump, a high-temperature heat         exchanger, a condenser, an evaporator and a high-temperature         regenerator. The condenser has a liquid refrigerant pipe which         passes through a pump and connects the evaporator, an evaporator         has a vapor channel which passes through a intermediate vapor         inlet channel and connects an expander, a compressor has a vapor         channel which passes through a high-temperature regenerator and         a high-temperature heat exchanger, connects the expander, the         expander has a low-pressure vapor channel connected the         high-temperature regenerator, the high-temperature regenerator         has a low-pressure vapor channel connected the evaporator, the         evaporator has a low-pressure vapor channel connected the         compressor and the second expander respectively, the second         expander has a low-pressure vapor channel connected the         condenser. The high-temperature heat exchanger has the heat         source medium channel connected the outside, the condenser has         the cooling medium channel connected the outside, the evaporator         has the heat source medium channel connected the outside if         necessary, the expander and the second expander connect the         second compressor and transmit power. The expander and the         second expander connect the compressor and the pump and transmit         power if necessary.     -   7. A combined cycle power device comprises an expander, a         compressor, a second expander, a pump, a high-temperature heat         exchanger, a condenser, an evaporator and a third expander. The         condenser has a liquid refrigerant pipe which passes through a         pump and connects the evaporator, an evaporator has a vapor         channel connects the third expander, the expander has a         low-pressure vapor channel connected the evaporator, a         compressor has a vapor channel which passes through a         high-temperature heat exchanger and the expander, the expander         has a low-pressure vapor channel connected the evaporator, the         evaporator has a low-pressure vapor channel connected the         compressor and the second expander respectively, the second         expander has a low-pressure vapor channel connected the         condenser. The high-temperature heat exchanger has the heat         source medium channel connected the outside, the condenser has         the cooling medium channel connected the outside, the evaporator         has the heat source medium channel connected the outside if         necessary, the expander, the second expander and the third         expander connect the second compressor and transmit power. The         expander, the second expander and the third expander connect the         compressor and the pump and transmit power if necessary.     -   8. A combined cycle power device comprises an expander, a         compressor, a second expander, a pump, a high-temperature heat         exchanger, a condenser, an evaporator and a heating unit. The         condenser has a liquid refrigerant pipe which passes through a         pump and connects the evaporator, an evaporator has a vapor         channel connects the high-temperature heat exchanger, the         high-temperature heat exchanger has a vapor channel connected         the expander, the expander has a low-pressure vapor channel         connected the evaporator, an evaporator has a low-pressure vapor         channel and connects the heating unit, the heating unit has a         low-pressure vapor channel and connects the compressor and the         second expander respectively, the second expander has a         low-pressure vapor channel connected the condenser. The         high-temperature heat exchanger has the heat source medium         channel connected the outside, the condenser has the cooling         medium channel connected the outside, or the evaporator has the         heat source medium channel connected the outside, the heating         unit has the heated medium channel connected the outside, the         expander and the second expander connect the second compressor         and transmit power. The expander and the second expander connect         the compressor and the pump and transmit power if necessary.     -   9. A combined cycle power device comprises an expander, a         compressor, a second expander, a pump, a high-temperature heat         exchanger, a condenser, an evaporator, a second high-temperature         heat exchanger and a second compressor. The condenser has a         liquid refrigerant pipe which passes through a pump and connects         the evaporator, an evaporator has a vapor channel connects the         high-temperature heat exchanger, the compressor has a vapor         channel connects the high-temperature heat exchanger, the         high-temperature heat exchanger has a vapor channel connected         the second compressor, the second compressor has a vapor channel         which passes through a second high-temperature heat exchanger         connects the expander, the expander has a low-pressure vapor         channel connected the evaporator, an evaporator has a         low-pressure vapor channel and connects the compressor and the         second expander respectively, the second expander has a         low-pressure vapor channel connected the condenser. The         high-temperature heat exchanger and the second high-temperature         heat exchanger has the heat source medium channel connected the         outside respectively, the condenser has the cooling medium         channel connected the outside, the evaporator has the heat         source medium channel connected the outside if necessary, the         expander and the second expander connect the second compressor         and transmit power. The expander and the second expander connect         the compressor and the second compressor and the pump and         transmit power if necessary.     -   10. A combined cycle power device comprises an expander, a         compressor, a second expander, a pump, a high-temperature heat         exchanger, a condenser, an evaporator, a second high-temperature         heat exchanger and a third expander. The condenser has a liquid         refrigerant pipe which passes through a pump and connects the         evaporator, an evaporator has a vapor channel connects the         high-temperature heat exchanger, the compressor has a vapor         channel connects the high-temperature heat exchanger, the         high-temperature heat exchanger has a vapor channel connected         the third expander, the third expander has a vapor channel which         passes through a second high-temperature heat exchanger connects         the expander, the expander has a low-pressure vapor channel         connected the evaporator, an evaporator has a low-pressure vapor         channel and connects the compressor and the second expander         respectively, the second expander has a low-pressure vapor         channel connected the condenser. The high-temperature heat         exchanger and the second high-temperature heat exchanger has the         heat source medium channel connected the outside respectively,         the condenser has the cooling medium channel connected the         outside, the evaporator has the heat source medium channel         connected the outside if necessary, the expander, the second         expander and the third expander connect the second compressor         and transmit power. The expander the second expander and the         third expander connect the compressor and the pump and transmit         power if necessary.     -   11. A combined cycle power device comprises an expander, a         compressor, a second expander, a pump, a high-temperature heat         exchanger, a condenser, an evaporator, a high-temperature         regenerator, a second high-temperature heat exchanger and a         second compressor. The condenser has a liquid refrigerant pipe         which passes through a pump and connects the evaporator, an         evaporator has a vapor channel which passes through the         high-temperature regenerator and connects a high-temperature         heat exchanger, a compressor has a vapor channel which passes         through the high-temperature regenerator and the         high-temperature heat exchanger, the high-temperature heat         exchanger has a vapor channel connects the second compressor,         the second compressor has a liquid refrigerant pipe which passes         through second high-temperature heat exchanger and connects the         expander, the expander has a low-pressure vapor channel which         passes through a high-temperature regenerator and connects the         evaporator, an evaporator has a low-pressure vapor channel and         connects the compressor and the second expander respectively,         the second expander has a low-pressure vapor channel connected         the condenser. The high-temperature heat exchanger and the         second high-temperature heat exchanger has the heat source         medium channel connected the outside respectively, the condenser         has the cooling medium channel connected the outside, the         evaporator has the heat source medium channel connected the         outside if necessary, the expander, the second expander connect         the compressor and the second compressor and transmit power. The         expander the second expander and the second expander connect the         compressor, the second compressor and the pump and transmit         power if necessary.     -   12. A combined cycle power device comprises an expander, a         compressor, a second expander, a pump, a high-temperature heat         exchanger, a condenser, an evaporator, a high-temperature         regenerator, a second high-temperature heat exchanger and a         third expander. The condenser has a liquid refrigerant pipe         which passes through a pump and connects the evaporator, an         evaporator has a vapor channel which passes through the         high-temperature regenerator and connects a high-temperature         heat exchanger, the vapor discharged from compressor flows         through the high-temperature regenerator for heat absorption,         and then enters the high-temperature heat exchanger for heat         absorption, the high-temperature heat exchanger has a vapor         channel and connects the third expander, the third expander has         a vapor channel which passes through the second high-temperature         heat exchanger and connects the third expander, the third         expander has a low-pressure vapor channel which passes through         the second high-temperature regenerator and connects the         evaporator, an evaporator has a low-pressure vapor channel and         connects the compressor and the second expander respectively,         the second expander has a low-pressure vapor channel connected         the condenser. The high-temperature heat exchanger and the         second high-temperature heat exchanger have the heat source         medium channel connected the outside respectively, the condenser         has the cooling medium channel connected the outside, the         evaporator has the heat source medium channel connected the         outside if necessary, the expander, the second expander and the         third expander connect the compressor and transmit power. The         expander the second expander and the third expander connect the         compressor and the pump and transmit power if necessary.     -   13. The device according to any one of claim 1-12, wherein         adding the low temperature regenerator and the second pump,         adjusting that the condenser has a liquid refrigerant pipe which         passes through a pump and connects the evaporator to that the         condenser has a liquid refrigerant pipe which passes through a         pump and connects a low temperature regenerator, the compressor         adds the vapor extraction channel connected the low temperature         regenerator, the low temperature regenerator has a liquid         refrigerant pipe which passes through the second pump and         connects the evaporator, a combined cycle power device is         formed.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a type 1 example general flow chart of a combined cycle power device provided in the present invention.

FIG. 2 is a type 2 example general flow chart of a combined cycle power device provided in the present invention.

FIG. 3 is a type 3 example general flow chart of a combined cycle power device provided in the present invention.

FIG. 4 is a type 4 example general flow chart of a combined cycle power device provided in the present invention.

FIG. 5 is a type 5 example general flow chart of a combined cycle power device provided in the present invention.

FIG. 6 is a type 6 example general flow chart of a combined cycle power device provided in the present invention.

FIG. 7 is a type 7 example general flow chart of a combined cycle power device provided in the present invention.

FIG. 8 is a type 8 example general flow chart of a combined cycle power device provided in the present invention.

FIG. 9 is a type 9 example general flow chart of a combined cycle power device provided in the present invention.

FIG. 10 is a type 10 example general flow chart of a combined cycle power device provided in the present invention.

FIG. 11 is a type 11 example general flow chart of a combined cycle power device provided in the present invention.

FIG. 12 is a type 12 example general flow chart of a combined cycle power device provided in the present invention.

FIG. 13 is a type 13 example general flow chart of a combined cycle power device provided in the present invention.

FIG. 14 is a type 14 example general flow chart of a combined cycle power device provided in the present invention.

FIG. 15 is a type 15 example general flow chart of a combined cycle power device provided in the present invention.

In the figures, 1—expander, 2—compressor, 3—the second expander, 4—circulating pump, 5—high temperature heat exchanger, 6—condenser, 7—evaporator (waste heat boiler), 8—heating unit, 9—high temperature regenerator, 10—the second high-temperature heat exchanger, 11—the third expander, 12—the second compressor, 13—low temperature regenerator, 14—the second pump.

DETAILED DESCRIPTION

The first thing to note is that, when describing the cycle's structures and processes, the processes will not be repeatedly described if not necessary, and the obvious processes will not be described. The detailed description of the present invention is as follows:

The combined cycle power device in FIG. 1 works as follows:

(1) Device structure. The combined cycle power device comprises an expander, a compressor, a second expander, a pump, a high-temperature heat exchanger, a condenser and an evaporator. A condenser 6 has a liquid refrigerant pipe which passes through a pump 4 and connects the evaporator 7, an evaporator 7 has a vapor channel connected a high-temperature heat exchanger 5, the high-temperature heat exchanger 5 has a vapor channel connected a compressor 1, a compressor 1 has a low-pressure vapor channel connected the evaporator 7, an evaporator 7 has a low-pressure vapor channel connected the compressor 2 and the second expander 3 respectively, the second expander 3 has a low-pressure vapor channel connected the condenser 6. The high-temperature heat exchanger 5 has the heat source medium channel connected the outside, the condenser 6 has the cooling medium channel connected the outside, the expander 1 and the second the expander 3 connect the compressor 2 and transmit power.

(2) Working processes. The condensate of the condenser 6 flows through the pump 4 and enters into the evaporator 7 in which it absorbs heat, vaporizes and superheats, and then enters the high-temperature heat exchanger 5 for heat absorption, The vapor discharged from compressor 2 enters the high-temperature heat exchanger 5 for heat absorption. The vapor discharged from the high-temperature heat exchanger 5 flows through the expander 1 to depressurize and output work. The low-pressure vapor discharged from the expander 1 flows through the evaporator 7 to release heat and cool down, and then is divided into two currents. The first current enters the compressor 2 for pressure rise and temperature rise. The second current flows through the expander 3 to depressurize and output work, and then enters the condenser 6 to release heat and condense. The heat source medium supplies the driving heat load through the high-temperature heat exchanger 5. The cooling medium takes away the low-temperature heat load through the condenser 6. The expander 1 and the second expander 3 supplies power to the compressor 1 and the outside. The expander 1 and the second expander 3 supplies power to the compressor 2, the pump 4 and the outside if necessary. The combined cycle power device is formed.

The combined cycle power device in FIG. 2 works as follows:

Based on combined cycle power device in FIG. 1, the evaporator 7 adds the heat source medium channel connected the outside. The condensate entering the evaporator 7 obtains the heat load provided by the low-pressure vapor and the heat source medium at the same time, heats up, vaporizes and superheats, and then enters the high-temperature heat exchanger 5. The combined cycle power device is formed.

The combined cycle power device in FIG. 3 works as follows:

(1) Device structure. The combined cycle power device comprises an expander, a compressor, a second expander, a pump, a high-temperature heat exchanger, a condenser, an evaporator and a heating unit. A condenser 6 has a liquid refrigerant pipe which passes through a pump 4 and connects the evaporator 7, an evaporator 7 has a vapor channel connected a high-temperature heat exchanger 5, a compressor 2 has a vapor channel connected the high-temperature heat exchanger 5, the high-temperature heat exchanger 5 has a vapor channel connected an expander 1, an expander 1 has a low-pressure vapor channel connected the heating unit 8, the heating unit 8 has a low-pressure vapor channel connected the compressor 2 and the second expander 3 respectively, the second expander 3 has a low-pressure vapor channel connected the condenser 6. The high-temperature heat exchanger 5 has the heat source medium connected the outside, the condenser 6 has the cooling medium channel connected the outside, the evaporator 7 has the heat source medium channel connected the outside, the heating unit 8 has the heated medium channel connected the outside, the expander 1 and the second the expander 3 connect the compressor 2 and transmit power.

(2) Working processes. The condensate of the condenser 6 flows through the pump 4 and enters into the evaporator 7 in which it absorbs heat, vaporizes and superheats, and then enters the high-temperature heat exchanger 5 for heat absorption. The vapor discharged from compressor 2 enters the high-temperature heat exchanger 5 for heat absorption. The vapor discharged from the high-temperature heat exchanger 5 flows through the expander 1 to depressurize and output work. The low-pressure vapor discharged from the expander 1 flows through the heating unit 8 to release heat and cool down, and then is divided into two currents. The first current enters the compressor 2 for pressure rise and temperature rise. The second current flows through the second expander 3 to depressurize and output work, and then enters the condenser 6 to release heat and condense. The heat source medium supplies the driving heat load through the high-temperature heat exchanger 5 and the evaporator 7. The cooling medium takes away the low-temperature heat load through the condenser 6. The heated medium takes away the medium temperature heat load through the heating unit 8. The expander 1 and the second expander 3 supplies power to the compressor 2 and the outside. Or the expander 1 and the second expander 3 supplies power to the compressor 2, the pump 4 and the outside if necessary. The combined cycle power device is formed.

The combined cycle power device in FIG. 4 works as follows:

(1) Device structure. The combined cycle power device comprises an expander, a compressor, a second expander, a pump, a high-temperature heat exchanger, a condenser, an evaporator and a high-temperature regenerator. An condenser 6 has a liquid refrigerant pipe which passes through a pump 4 and connects the evaporator 7, an evaporator 7 has a low-pressure vapor channel which passes through a high-temperature regenerator 9 and connects the high-temperature heat exchanger 5, a compressor 2 has a vapor channel which passes through the high-temperature regenerator 9 and connects the high-temperature heat exchanger 5, the high-temperature heat exchanger 5 has a vapor channel connected the expander 1, the expander 1 has a low-pressure vapor channel connected the high-temperature regenerator 9. The high-temperature regenerator 9 has the heat source medium connected the evaporator 7, an evaporator 7 has a low-pressure vapor channel connected the compressor 2 and the second expander 3 respectively, the second expander 3 has a low-pressure vapor channel connected the condenser 6. The high-temperature heat exchanger 5 has the heat source medium channels connected the outside, the condenser 6 has the cooling medium channel connected the outside, the expander 1 and the second the expander 3 connect the compressor 2 and transmit power.

(2) Working processes. The condensate of the condenser 6 flows through the pump 4 and enters into the evaporator 7 in which it absorbs heat, vaporizes and superheats. The superheated vapor flows through the high-temperature regenerator 9 for heat absorption, and then enters the high-temperature heat exchanger 5 for heat absorption. The vapor discharged from compressor 2 flows through the high-temperature regenerator 9 for heat absorption, and then enters the high-temperature heat exchanger 5 for heat absorption. The vapor discharged from the high-temperature heat exchanger 5 flows through the expander 1 to depressurize and output work. The low-pressure vapor discharged from the expander 1 flows through the high-temperature regenerator 9 and the evaporator 7 to release heat and cool down, and then is divided into two currents. The first current enters the compressor 2 for pressure rise and temperature rise. The second current flows through the second expander 3 to depressurize and output work, and then enters the condenser 6 to release heat and condense. The heat source medium supplies the driving heat load through the high-temperature heat exchanger 5. The cooling medium takes away the low-temperature heat load through the condenser 6. The expander 1 and the second expander 3 supplies power to the compressor 2 and the outside. Or the expander 1 and the second expander 3 supplies power to the compressor 2, the pump 4 and the outside if necessary. The combined cycle power device is formed.

The combined cycle power device in FIG. 5 works as follows:

(1) Device structure. The combined cycle power device comprises an expander, a compressor, a second expander, a pump, a high-temperature heat exchanger, a condenser, an evaporator and the second high-temperature heat exchanger. The condenser 6 has a liquid refrigerant pipe which passes through a pump 4 and connects the evaporator 7), an evaporator 7 has a vapor channel connects the second high-temperature heat exchanger 10, the second high-temperature heat exchanger 10 has a vapor channel connects an expander 1, a compressor 2 has a vapor channel connects the high-temperature heat exchanger 5, the high-temperature heat exchanger 5 has a vapor channel which passes through a intermediate vapor inlet channel and connects the expander 1, the expander 1 has a low-pressure vapor channel connected the evaporator 7, the evaporator 7 has a low-pressure vapor channel connected the compressor 2 and a second expander 3 respectively, the second expander 3 has a low-pressure vapor channel connected the condenser 6. The high-temperature heat exchanger 5 and the second high-temperature heat exchanger 10 have the heat source medium channels connected the outside, the condenser 6 has the cooling medium channel connected the outside, the expander 1 and the second expander 3 connect the compressor (2) and transmit power.

(2) Working processes. The condensate of the condenser 6 flows through the pump 4, the evaporator 7 and the second high-temperature heat exchanger 10 and absorbs heat, vaporizes and superheats, and then enters the expander 1 to depressurize and output work. The vapor discharged from compressor 2 flows through the high-temperature heat exchanger 5 for heat absorption, and then enters the expander 1 to depressurize and output work. The low-pressure vapor discharged from the expander 1 flows through the evaporator 7 to release heat and cool down, and then is divided into two currents. The first current enters the compressor 2 for pressure rise and temperature rise. The second current flows through the second expander 3 to depressurize and output work, and then enters the condenser 6 to release heat and condense. The heat source medium supplies the driving heat load through the high-temperature heat exchanger 5 and the second high-temperature heat exchanger 10. The cooling medium takes away the low-temperature heat load through the condenser 6. The expander 1 and the second expander 3 supplies power to the compressor 2 and the outside. Or the expander 1 and the second expander 3 supplies power to the compressor 2, the pump 4 and the outside if necessary. The combined cycle power device is formed.

The combined cycle power device in FIG. 6 works as follows:

(1) Device structure. The combined cycle power device comprises an expander, a compressor, a second expander, a pump, a high-temperature heat exchanger, a condenser and an evaporator. The condenser 6 has a liquid refrigerant pipe which passes through a pump 4 and connects the evaporator 7, an evaporator 7 has a vapor channel which passes through a intermediate vapor inlet channel and connects an expander 1, a compressor 2 has a vapor channel which passes through a high-temperature heat exchanger 5 and connects the expander 1, the expander 1 has a low-pressure vapor channel connected the evaporator 7, the evaporator 7 has a low-pressure vapor channel connected the compressor 2 and the second expander 3 respectively, the second expander 3 has a low-pressure vapor channel connected the condenser 6. The high-temperature heat exchanger 5 has the heat source medium channel connected the outside, the condenser 6 has the cooling medium channel connected the outside, the expander 1 and the second expander 3 connect the second compressor 2 and transmit power.

(2) Working processes. The condensate of the condenser 6 flows through the pump 4 and enters the evaporator 7 in which it absorbs heat, vaporizes and superheats, and then enters the expander 1 to depressurize and output work. The vapor discharged from compressor 2 flows through the high-temperature heat exchanger 5 for heat absorption, and then enters the expander 1 to depressurize and output work. The low-pressure vapor discharged from the expander 1 flows through the evaporator 7 to release heat and cool down, and then is divided into two currents. The first current enters the compressor 2 for pressure rise and temperature rise. The second current flows through the second expander 3 to depressurize and output work, and then enters the condenser 6 to release heat and condense. The heat source medium supplies the driving heat load through the high-temperature heat exchanger 5. The cooling medium takes away the low-temperature heat load through the condenser 6. The expander 1 and the second expander 3 supplies power to the compressor 2 and the outside. Or the expander 1 and the second expander 3 supplies power to the compressor 2, the pump 4 and the outside if necessary. The combined cycle power device is formed.

The combined cycle power device in FIG. 7 works as follows:

(1) Device structure. The combined cycle power device comprises an expander, a compressor, a second expander, a pump, a high-temperature heat exchanger, a condenser and a high-temperature regenerator. The condenser 6 has a liquid refrigerant pipe which passes through a pump 4 and connects the evaporator 7, an evaporator 7 has a vapor channel which passes through a intermediate vapor inlet channel and connects an expander 1, a compressor 2 has a vapor channel which passes through a high-temperature regenerator 9 and a high-temperature heat exchanger 5, connects the expander 1, the expander 1 has a low-pressure vapor channel connected the high-temperature regenerator 9, the high-temperature regenerator 9 has a low-pressure vapor channel connected the evaporator 7, the evaporator 7 has a low-pressure vapor channel connected the compressor 2 and the second expander 3 respectively, the second expander 3 has a low-pressure vapor channel connected the condenser 6. The high-temperature heat exchanger 5 has the heat source medium channel connected the outside, the condenser 6 has the cooling medium channel connected the outside, the expander 1 and the second expander 3 connect the second compressor 2 and transmit power.

(2) Working processes. The condensate of the condenser 6 flows through the pump 4 and enters the evaporator 7 in which it absorbs heat, vaporizes and superheats, and then enters the expander 1 to depressurize and output work. The vapor discharged from compressor 2 flows through the high-temperature regenerator 9 and the high-temperature heat exchanger 5 for heat absorption, and then enters the expander 2 to depressurize and output work. The low-pressure vapor discharged from the expander 1 flows through the high-temperature regenerator 9 and the evaporator 7 to release heat and cool down, and then is divided into two currents. The first current enters the compressor 2 for pressure rise and temperature rise. The second current flows through the second expander 3 to depressurize and output work, and then enters the condenser 6 to release heat and condense. The heat source medium supplies the driving heat load through the high-temperature heat exchanger 5. The cooling medium takes away the low-temperature heat load through the condenser 6. The expander 1 and the second expander 3 supplies power to the compressor 2 and the outside. Or the expander 1 and the second expander 3 supplies power to the compressor 2, the pump 4 and the outside if necessary. The combined cycle power device is formed.

The combined cycle power device in FIG. 8 works as follows:

(1) Device structure. The combined cycle power device comprises an expander, a compressor, a second expander, a pump, a high-temperature heat exchanger, a condenser, an evaporator and a third expander. The condenser 6 has a liquid refrigerant pipe which passes through a pump 4 and connects the evaporator 7, an evaporator 7 has a vapor channel connects the third expander 11, the expander 11 has a low-pressure vapor channel connected the evaporator 7, a compressor 2 has a vapor channel which passes through a high-temperature heat exchanger 5 and the expander 1, the expander 1 has a low-pressure vapor channel connected the evaporator 7, the evaporator 7 has a low-pressure vapor channel connected the compressor 2 and the second expander 3 respectively, the second expander 3 has a low-pressure vapor channel connected the condenser 6. The high-temperature heat exchanger 5 has the heat source medium channel connected the outside, the condenser 6 has the cooling medium channel connected the outside, the evaporator 7 has the heat source medium channel connected the outside if necessary, the expander 1, the second expander 3 and the third expander 11 connect the second compressor 2 and transmit power.

(2) Working processes. The condensate of the condenser 6 flows through the pump 4 and enters the evaporator 7 in which it absorbs heat, vaporizes and superheats, and then enters the third expander 11 to depressurize and output work. The low-pressure vapor discharged from the third expander 11 enters the evaporator 7 to release heat and cool down. The vapor discharged from the compressor 2 flows through the high-temperature heat exchanger 5 for heat absorption, and then enters the expander 1 to depressurize and output work. The low-pressure vapor discharged from the expander 1 enters the evaporator 7 to release heat and cool down, and then is divided into two currents. The first current enters the compressor 2 for pressure rise and temperature rise. The second current flows through the second expander 3 to depressurize and output work, and then enters the condenser 6 to release heat and condense. The heat source medium supplies the driving heat load through the high-temperature heat exchanger 5 and the evaporator 7. The cooling medium takes away the low-temperature heat load through the condenser 6. The expander 1, the second expander 3 and third expander 11 supply power to the compressor 2 and the outside. Or the expander 1, the second expander 3 and third expander 11 supplies power to the compressor 2, the pump 4 and the outside if necessary. The combined cycle power device is formed.

The combined cycle power device in FIG. 9 works as follows:

(1) Device structure. The combined cycle power device comprises an expander, a compressor, a second expander, a pump, a high-temperature heat exchanger, a condenser, an evaporator and a heating unit. The condenser 6 has a liquid refrigerant pipe which passes through a pump 4 and connects the evaporator 7, an evaporator 7 has a vapor channel connects the high-temperature heat exchanger 5, a compressor 2 has a vapor channel connects the high-temperature heat exchanger 5, the high-temperature heat exchanger 5 has a vapor channel connected the expander 1, the expander 1 has a low-pressure vapor channel connected the evaporator 7, an evaporator 7 has a low-pressure vapor channel and connects the heating unit 8, the heating unit 8 has a low-pressure vapor channel and connects the compressor 2 and the second expander 3) respectively, the second expander 3 has a low-pressure vapor channel connected the condenser 6. The high-temperature heat exchanger 5 has the heat source medium channel connected the outside, the condenser 6 has the cooling medium channel connected the outside, the heating unit 8 has the heated medium channel connected the outside, the expander 1 and the second expander 3 connect the second compressor 2 and transmit power.

(2) Working processes. The condensate of the condenser 6 flows through the pump 4 and enters the evaporator 7 in which it absorbs heat, vaporizes and superheats, and then enters the high-temperature heat exchanger 5 for heat absorption. The vapor discharged from compressor 2 enters the high-temperature heat exchanger 5 for heat absorption. The vapor discharged from the high-temperature heat exchanger 5 flows through the expander 1 to depressurize and output work. The low-pressure vapor discharged from the expander 1 flows through the evaporator 7 and heating unit 8 to release heat and cool down, and then is divided into two currents. The first current enters the compressor 2 for pressure rise and temperature rise. The second current flows through the second expander 3 to depressurize and output work, and then enters the condenser 6 to release heat and condense. The heat source medium supplies the driving heat load through the high-temperature heat exchanger 5. The cooling medium takes away the low-temperature heat load through the condenser 6. The heated medium takes away the medium temperature heat load through the heating unit 8. The expander 1 and the second expander 3 supply power to the compressor 2 and the outside. Or the expander 1 and the second expander 3 supply power to the compressor 2, the pump 4 and the outside if necessary. The combined cycle power device is formed.

The combined cycle power device in FIG. 10 works as follows:

(1) Device structure. The combined cycle power device comprises an expander, a compressor, a second expander, a pump, a high-temperature heat exchanger, a condenser, an evaporator, a second high-temperature heat exchanger and a second compressor. The condenser 6 has a liquid refrigerant pipe which passes through a pump 4 and connects the evaporator 7, an evaporator 7 has a vapor channel connects the high-temperature heat exchanger 5, the compressor 2 has a vapor channel connects the high-temperature heat exchanger 5, the high-temperature heat exchanger 5 has a vapor channel connected the second compressor 12, the second compressor 12 has a vapor channel which passes through a second high-temperature heat exchanger 10 and connects the expander 1, the expander 1 has a low-pressure vapor channel connected the evaporator 7, an evaporator 7 has a low-pressure vapor channel and connects the compressor 2 and the second expander 3 respectively, the second expander 3 has a low-pressure vapor channel connected the condenser 6. The high-temperature heat exchanger 5 and the second high-temperature heat exchanger 10 has the heat source medium channel connected the outside respectively, the condenser 6 has the cooling medium channel connected the outside, the expander 1 and the second expander 3 connect the second compressor 2 and transmit power.

(2) Working processes. The condensate of the condenser 6 flows through the pump 4 and enters the evaporator 7 in which it absorbs heat, vaporizes and superheats, and then enters the high-temperature heat exchanger 5 for heat absorption. The vapor discharged from compressor 2 enters the high-temperature heat exchanger 5 for heat absorption. The vapor discharged from the high-temperature heat exchanger 5 flows through the second compressor 12 to pressurize, the second high-temperature heat exchanger 10 for heat absorption and the expander 2 to depressurize and output work. The low-pressure vapor discharged from the expander 1 flows through the evaporator 7 to release heat and cool down, and then is divided into two currents. The first current enters the compressor 2 for pressure rise and temperature rise. The second current flows through the second expander 3 to depressurize and output work, and then enters the condenser 6 to release heat and condense. The heat source medium supplies the driving heat load through the high-temperature heat exchanger 5 and the second high-temperature heat exchanger 10. The cooling medium takes away the low-temperature heat load through the condenser 6. The expander 1 and the second expander 3 supply power to the compressor 2, the second compressor 12 and the outside. Or the expander 1 and the second expander 3 supply power to the compressor 2, the second compressor 12, the pump 4 and the outside if necessary. The combined cycle power device is formed.

The combined cycle power device in FIG. 11 works as follows:

(1) Device structure. The combined cycle power device comprises an expander, a compressor, a second expander, a pump, a high-temperature heat exchanger, a condenser, an evaporator, a second high-temperature heat exchanger and a third expander. The condenser 6 has a liquid refrigerant pipe which passes through a pump 4 and connects the evaporator 7, an evaporator 7 has a vapor channel connects the high-temperature heat exchanger 5, the compressor 2 has a vapor channel connects the high-temperature heat exchanger 5, the high-temperature heat exchanger 5 has a vapor channel connected the third expander 11, the third expander 11 has a vapor channel which passes through a second high-temperature heat exchanger 10 connects the expander 1, the expander 1 has a low-pressure vapor channel connected the evaporator 7, an evaporator 7 has a low-pressure vapor channel and connects the compressor 2 and the second expander 3 respectively, the second expander 3 has a low-pressure vapor channel connected the condenser 6. The high-temperature heat exchanger 5 and the second high-temperature heat exchanger 10 has the heat source medium channel connected the outside respectively, the condenser 6 has the cooling medium channel connected the outside, the expander 1, the second expander 3 and the third expander 11 connect the second compressor 2 and transmit power.

(2) Working processes. The condensate of the condenser 6 flows through the pump 4 and enters the evaporator 7 in which it absorbs heat, vaporizes and superheats, and then enters the high-temperature heat exchanger 5 for heat absorption. The vapor discharged from compressor 2 enters the high-temperature heat exchanger 5 for heat absorption. The vapor discharged from the high-temperature heat exchanger 5 flows through the third expander 11 to depressurize and output work, the second high-temperature heat exchanger 10 for heat absorption and the expander 1 to depressurize and output work. The low-pressure vapor discharged from the expander 1 flows through the evaporator 7 to release heat and cool down, and then is divided into two currents. The first current enters the compressor 2 for pressure rise and temperature rise. The second current flows through the second expander 3 to depressurize and output work, and then enters the condenser 6 to release heat and condense. The heat source medium supplies the driving heat load through the high-temperature heat exchanger 5 and the second high-temperature heat exchanger 10. The cooling medium takes away the low-temperature heat load through the condenser 6. The expander 1, the second expander 3 and the third expander 11 supply power to the compressor 2 and the outside. The expander 1, the second expander 3 and the third expander 11 supply power to the compressor 2, the pump 4 and the outside if necessary. The combined cycle power device is formed.

The combined cycle power device in FIG. 12 works as follows:

(1) Device structure. The combined cycle power device comprises an expander, a compressor, a second expander, a pump, a high-temperature heat exchanger, a condenser, an evaporator, a high-temperature regenerator, a second high-temperature heat exchanger and a second compressor. The condenser 6 has a liquid refrigerant pipe which passes through a pump 4 and connects the evaporator 7, an evaporator 7 has a vapor channel which passes through the high-temperature regenerator 9 and connects the high-temperature heat exchanger 5, a compressor 2 has a vapor channel which passes through a high-temperature regenerator 9 and the high-temperature heat exchanger 5, The high-temperature heat exchanger 5 has a vapor channel connects the second compressor 12, the second compressor 12 has a liquid refrigerant pipe which passes through second high-temperature heat exchanger 10 and connects the expander 1, the expander 1 has a low-pressure vapor channel which passes through a high-temperature regenerator 9 and connects the evaporator 7, an evaporator 7 has a low-pressure vapor channel and connects the compressor 2 and the second expander 3 respectively, the second expander 3 has a low-pressure vapor channel connected the condenser 6. The high-temperature heat exchanger 5 and the second high-temperature heat exchanger 10 has the heat source medium channel connected the outside respectively, the condenser 6 has the cooling medium channel connected the outside, the expander 1, the second expander 3 connect the compressor 2 and the second compressor 12, transmit power.

(2) Working processes. The condensate of the condenser 6 flows through the pump 4 and enters the evaporator 7 in which it absorbs heat, vaporizes and superheats. The superheated vapor flows through the high-temperature regenerator 9 for heat absorption, and then enters the high-temperature heat exchanger 5 for heat absorption. The vapor discharged from compressor 2 flows through the high-temperature regenerator 9 for heat absorption, and then enters the high-temperature heat exchanger 5 for heat absorption. The vapor discharged from the high-temperature heat exchanger 5 flows through the second compressor 12 to pressurize, the second high-temperature heat exchanger 10 for heat absorption and the expander 1 to depressurize and output work. The low-pressure vapor discharged from the expander 1 flows through the high-temperature regenerator 9 and the evaporator 7 to release heat and cool down, and then is divided into two currents. The first current enters the compressor 2 for pressure rise and temperature rise. The second current flows through the second expander 3 to depressurize and output work, and then enters the condenser 6 to release heat and condense. The heat source medium supplies the driving heat load through the high-temperature heat exchanger 5 and the second high-temperature heat exchanger 10. The cooling medium takes away the low-temperature heat load through the condenser 6. The expander 2 and the second expander 3 supplies power to the compressor 2, the second compressor 12 and the outside. The expander 2 and the second expander 3 supplies power to the compressor 2, the pump 4, the second compressor 12 and the outside if necessary. The combined cycle power device is formed.

The combined cycle power device in FIG. 13 works as follows:

(1) Device structure. The combined cycle power device comprises an expander, a compressor, a second expander, a pump, a high-temperature heat exchanger, a condenser, an evaporator, a high-temperature regenerator, a second high-temperature heat exchanger and a third expander. The condenser 6 has a liquid refrigerant pipe which passes through a pump 4 and connects the evaporator 7, an evaporator 7 has a vapor channel which passes through the high-temperature regenerator 9 and connects the high-temperature heat exchanger 5, the high-temperature heat exchanger 5 has a vapor channel and connects the third expander 11, the third expander 11 has a vapor channel which passes through the second high-temperature heat exchanger 10 and connects the third expander 1, the third expander 1 has a low-pressure vapor channel which passes through the second high-temperature regenerator 9 and connects the evaporator 7, an evaporator 7 has a low-pressure vapor channel and connects the compressor 2 and the second expander 3 respectively, the second expander 3 has a low-pressure vapor channel connected the condenser 6. The high-temperature heat exchanger 5 and the second high-temperature heat exchanger 10 have the heat source medium channel connected the outside respectively, the condenser 6 has the cooling medium channel connected the outside, the expander 1, the second expander 3 and the third expander 11 connect the compressor 2 and transmit power.

(2) Working processes. The condensate of the condenser 6 flows through the pump 4 and enters the evaporator 7 in which it absorbs heat, vaporizes and superheats. The superheated vapor flows through the high-temperature regenerator 9 for heat absorption, and then enters the high-temperature heat exchanger 5 for heat absorption. The vapor discharged from compressor 2 flows through the high-temperature regenerator 9 for heat absorption, and then enters the high-temperature heat exchanger 5 for heat absorption. The vapor discharged from the high-temperature heat exchanger 5 flows through the third expander 11 to depressurize and output work, the second high-temperature heat exchanger 10 for heat absorption and the expander 1 to depressurize and output work. The low-pressure vapor discharged from the expander 1 flows through the high-temperature regenerator 9 and the evaporator 7 to release heat and cool down, and then is divided into two currents. The first current enters the compressor 2 for pressure rise and temperature rise. The second current flows through the second expander 3 to depressurize and output work, and then enters the condenser 6 to release heat and condense. The heat source medium supplies the driving heat load through the high-temperature heat exchanger 5 and the second high-temperature heat exchanger 10. The cooling medium takes away the low-temperature heat load through the condenser 6. The expander 1, the second expander 3 and the third expander 11 supply power to the compressor and the outside. Or the expander 1, the second expander 3 and the third expander 11 supply power to the compressor 2, the pump 4 and the outside if necessary. The combined cycle power device is formed.

The combined cycle power device in FIG. 14 works as follows:

(1) Structurally, based on combined cycle power device in FIG. 1, a low temperature regenerator and the second pump is added. That a condenser 6 has a liquid refrigerant pipe which passes through a pump 4 and connects the evaporator 7 is adjusted for that a condenser 6 has a liquid refrigerant pipe which passes through a pump 4 and connects a low temperature regenerator 13. The compressor 2 adds a vapor extraction channel connected the low temperature regenerator 13. The low temperature regenerator 13 has a liquid refrigerant pipe which passes through the second pump 14 and connects the evaporator 7.

(2) Working processes. The condensate of the condenser 6 flows through the pump 4 and enters the low temperature regenerator 13 in which it mixes with the vapor extraction from the compressor 2 for heat absorption. The vapor extraction releases and is condensed. The condensate of the low temperature regenerator 13 flows through the second pump 14 and enters the evaporator 7 in which it absorbs heat, vaporizes and superheats, and then enters the high-temperature heat exchanger 5 for heat absorption. The vapor discharged from compressor 2 enters the high-temperature heat exchanger 5 for heat absorption. The vapor discharged from the high-temperature heat exchanger 5 flows through the expander 1 to depressurize and output work. The low-pressure vapor discharged from the expander 1 flows through the evaporator 7 to release heat and cool down, and then is divided into two currents. The first current enters the compressor 2 for pressure rise and temperature rise. The second current flows through the second expander 3 to depressurize and output work, and then enters the condenser 6 to release heat and condense. The low-pressure vapor entering the compressor 2 is compressed to the certain extent and then divided into two currents. The first current enters the low temperature regenerator 13 by the intermediate extraction channel. The second current continues to boost pressure and temperature. The heat source medium supplies the driving heat load through the high-temperature heat exchanger 5. The cooling medium takes away the low-temperature heat load through the condenser 6. The expander 1 and the second expander 3 supplies power to the compressor 2 and the outside. Or the expander 1 and the second expander 3 supplies power to the compressor 2, the pump 4, the second pump 13 and the outside if necessary. The combined cycle power device is formed.

The combined cycle power device in FIG. 15 works as follows:

(1) Structurally, based on combined cycle power device in FIG. 3, a low temperature regenerator and the second pump is added. That a condenser 6 has a liquid refrigerant pipe which passes through a pump 4 and connects the evaporator 7 is adjusted for that a condenser 6 has a liquid refrigerant pipe which passes through a pump 4 and connects a low temperature regenerator 13. The compressor 2 adds a vapor extraction channel connected the low temperature regenerator 13. The low temperature regenerator 13 has a liquid refrigerant pipe which passes through the second pump 14 and connects the evaporator 7.

(2) Working processes. The condensate of the condenser 6 flows through the pump 4 and enters the low temperature regenerator 13 in which it mixes with the vapor extraction from the compressor 2 for heat absorption. The vapor extraction releases and is condensed. The condensate of the low temperature regenerator 13 flows through the second pump 14 and enters the evaporator 7 in which it absorbs heat, vaporizes and superheats, and then enters the high-temperature heat exchanger 5 for heat absorption. The vapor discharged from compressor 2 enters the high-temperature heat exchanger 5 for heat absorption. The vapor discharged from the high-temperature heat exchanger 5 flows through the expander 1 to depressurize and output work. The low-pressure vapor discharged from the expander 1 flows through the heating unit 8 to release heat and cool down, and then is divided into two currents. The first current enters the compressor 2 for pressure rise and temperature rise. The second current flows through the second expander 3 to depressurize and output work, and then enters the condenser 6 to release heat and condense. The low-pressure vapor entering the compressor 2 is compressed to the certain extent and then divided into two currents. The first current enters the low temperature regenerator 13 by the intermediate extraction channel. The second current continues to boost pressure and temperature. The heat source medium supplies the driving heat load through the high-temperature heat exchanger 5 and the evaporator 7. The cooling medium takes away the low-temperature heat load through the condenser 6. The heated medium takes away the medium temperature heat load through the heating unit 8. The expander 1 and the second expander 3 supplies power to the compressor 2 and the outside. Or the expander 1 and the second expander 3 supplies power to the compressor 2, the pump 4, the second pump 13 and the outside if necessary. The combined cycle power device is formed.

The technical effects of the present invention: the combined cycle power device proposed by the present invention has the following effects and advantages:

(1) The circulating working medium absorbs heat at high-temperature heat under low pressure. The temperature difference loss between the circulating working medium and the high-temperature heat source is small, which is conducive to improving the thermal efficiency of the system and the safety of the device.

(2) The circulating working medium mainly relies on the condensation phase transformation process to realize low temperature heat release. The temperature difference loss between the circulating working medium and the environment is controllable, which is conducive to improving the thermal efficiency.

(3) The present invention adopts the low-pressure and high-temperature operation mode to work in the high-temperature region. Therefore, the contradiction among thermal efficiency, the working medium's parameters and the material's temperature resistance and pressure resistance abilities, which is common in traditional vapor power devices, can be resolved. The temperature difference loss between the heat source and the circulating medium can be greatly reduced, and the thermal efficiency can be greatly improved.

(4) In the present invention, the equipment is shared to increase the heat absorption process of the lower cycle (Rankine cycle) and improve the thermal efficiency.

(5) The present invention only uses a single working medium, which reduce the operation cost and improve the flexibility of thermal device.

(6) When the high-temperature expander is shared, the number of core equipment is reduced, which is conducive to reducing system investment and improving thermal efficiency.

(7) The lower cycle adopts double expansion process, which is conducive to flexible adjustment of working parameters and adaptability.

(8) The present invention effectively deals with the high-temperature heat source and the variable temperature heat source, the high-quality fuel and the non high-quality fuel, and has a wide range of application.

(9) On the premise of realizing high thermal efficiency, the device in the present invention can be selected to operate at low pressure, so as to greatly improve the operation safety of the device.

(10) The present invention can realize the heat recovery of enterprise device simply, actively, safely and efficiently.

(11) The thermal efficiency improves effectively when the present invention is applied to the lower end of the gas-steam combined cycle.

(12) When the present invention is applied to the coal-fired thermal system, it can maintain the original advantages of the traditional steam power cycle in which water vapor is used as working medium and has a wide range of working parameters. According to the actual situation, the present invention can work in subcritical, critical, supercritical or ultra supercritical state, etc. 

What is claimed is:
 1. A combined cycle power device comprising an expander, a compressor, a second expander, a pump, a high-temperature heat exchanger, a condenser and an evaporator; wherein a condenser (6) has a liquid refrigerant pipe which passes through a pump (4) and connects the evaporator (7), an evaporator (7) has a vapor channel connected a high-temperature heat exchanger (5), a compressor (2) has a vapor channel connected the high-temperature heat exchanger (5), the high-temperature heat exchanger (5) has a vapor channel connected an expander (1), the expander (1) has a low-pressure vapor channel connected the evaporator (7), an evaporator (7) has a low-pressure vapor channel connected the compressor (2) and the second expander (3) respectively, the second expander (3) has a low-pressure vapor channel connected the condenser (6); wherein the high-temperature heat exchanger (5) has the heat source medium channel connected the outside, the condenser (6) has the cooling medium channel connected the outside, or the evaporator (7) has the heat source medium channel connected the outside, the expander (1) and the second the expander (3) connect the compressor (2) and transmit power, wherein the expander (1) and the second expander (3) connect the compressor (2) and the pump (4) and transmit power if necessary.
 2. A combined cycle power device comprising an expander, a compressor, a second expander, a pump, a high-temperature heat exchanger, a condenser, an evaporator and a heating unit; wherein a condenser (6) has a liquid refrigerant pipe which passes through a pump (4) and connects the evaporator (7), an evaporator (7) has a vapor channel connected a high-temperature heat exchanger (5), a compressor (2) has a vapor channel connected the high-temperature heat exchanger (5), the high-temperature heat exchanger (5) has a vapor channel connected an expander (1), an expander (1) has a low-pressure vapor channel connected the heating unit (8), the heating unit (8) has a low-pressure vapor channel connected the compressor (2) and the second expander (3) respectively, the second expander (3) has a low-pressure vapor channel connected the condenser (6); wherein the high-temperature heat exchanger (5) has the heat source medium connected the outside, the condenser (6) has the cooling medium channel connected the outside, the evaporator (7) has the heat source medium channel connected the outside, the heating unit (8) has the heated medium channel connected the outside, the expander (1) and the second the expander (3) connect the compressor (2) and transmit power, wherein the expander (1) and the second expander (3) connect the compressor (2) and the pump (4) and transmit power if necessary.
 3. A combined cycle power device comprising an expander, a compressor, a second expander, a pump, a high-temperature heat exchanger, a condenser, an evaporator and a high-temperature regenerator; wherein an condenser (6) has a liquid refrigerant pipe which passes through a pump (4) and connects the evaporator (7), an evaporator (7) has a low-pressure vapor channel which passes through a high-temperature regenerator (9) and connects the high-temperature heat exchanger (5), a compressor (2) has a vapor channel which passes through the high-temperature regenerator (9) and connects the high-temperature heat exchanger (5), the high-temperature heat exchanger (5) has a vapor channel connected the expander (1), the expander (1) has a low-pressure vapor channel connected the high-temperature regenerator (9), the high-temperature regenerator (9) has the heat source medium connected the evaporator (7), an evaporator (7) has a low-pressure vapor channel connected the compressor (2) and the second expander (3) respectively, the second expander (3) has a low-pressure vapor channel connected the condenser (6), the high-temperature heat exchanger (5) has the heat source medium channels connected the outside, the condenser (6) has the cooling medium channel connected the outside, or the evaporator (7) has the heat source medium channel connected the outside, the expander (1) and the second the expander (3) connect the compressor (2) and transmit power, wherein the expander (1) and the second expander (3) connect the compressor (2) and the pump (4) and transmit power if necessary.
 4. A combined cycle power device comprising an expander, a compressor, a second expander, a pump, a high-temperature heat exchanger, a condenser, an evaporator and the second high-temperature heat exchanger; wherein the condenser (6) has a liquid refrigerant pipe which passes through a pump (4) and connects the evaporator (7), an evaporator (7) has a vapor channel connects the second high-temperature heat exchanger (10), the second high-temperature heat exchanger (10) has a vapor channel connects an expander (1), a compressor (2) has a vapor channel connects the high-temperature heat exchanger (5), the high-temperature heat exchanger (5) has a vapor channel which passes through a intermediate vapor inlet channel and connects the expander (1), the expander (1) has a low-pressure vapor channel connected the evaporator (7), the evaporator (7) has a low-pressure vapor channel connected the compressor (2) and a second expander (3) respectively, the second expander (3) has a low-pressure vapor channel connected the condenser (6); wherein the high-temperature heat exchanger (5) and the second high-temperature heat exchanger (10) have the heat source medium channels connected the outside, the condenser (6) has the cooling medium channel connected the outside, the evaporator (7) has the heat source medium channel connected the outside if necessary, the expander (1) and the second expander (3) connect the compressor (2) and transmit power, wherein the expander (1) and the second expander (3) connect the compressor (2) and the pump (4) and transmit power if necessary.
 5. A combined cycle power device comprising an expander, a compressor, a second expander, a pump, a high-temperature heat exchanger, a condenser and an evaporator; wherein the condenser (6) has a liquid refrigerant pipe which passes through a pump (4) and connects the evaporator (7), an evaporator (7) has a vapor channel which passes through a intermediate vapor inlet channel and connects an expander (1), a compressor (2) has a vapor channel which passes through a high-temperature heat exchanger (5) and connects the expander (1), the expander (1) has a low-pressure vapor channel connected the evaporator (7), the evaporator (7) has a low-pressure vapor channel connected the compressor (2) and the second expander (3) respectively, the second expander (3) has a low-pressure vapor channel connected the condenser (6); wherein the high-temperature heat exchanger (5) has the heat source medium channel connected the outside, the condenser (6) has the cooling medium channel connected the outside, the evaporator (7) has the heat source medium channel connected the outside if necessary, the expander (1) and the second expander (3) connect the second compressor (2) and transmit power, wherein the expander (1) and the second expander (3) connect the compressor (2) and the pump (4) and transmit power if necessary.
 6. A combined cycle power device comprising an expander, a compressor, a second expander, a pump, a high-temperature heat exchanger, a condenser, an evaporator and a high-temperature regenerator; wherein the condenser (6) has a liquid refrigerant pipe which passes through a pump (4) and connects the evaporator (7), an evaporator (7) has a vapor channel which passes through a intermediate vapor inlet channel and connects an expander (1), a compressor (2) has a vapor channel which passes through a high-temperature regenerator (9) and a high-temperature heat exchanger (5), connects the expander (1), the expander (1) has a low-pressure vapor channel connected the high-temperature regenerator (9), the high-temperature regenerator (9) has a low-pressure vapor channel connected the evaporator (7), the evaporator (7) has a low-pressure vapor channel connected the compressor (2) and the second expander (3) respectively, the second expander (3) has a low-pressure vapor channel connected the condenser (6); wherein the high-temperature heat exchanger (5) has the heat source medium channel connected the outside, the condenser (6) has the cooling medium channel connected the outside, the evaporator (7) has the heat source medium channel connected the outside if necessary, the expander (1) and the second expander (3) connect the second compressor (2) and transmit power, wherein the expander (1) and the second expander (3) connect the compressor (2) and the pump (4) and transmit power if necessary.
 7. A combined cycle power device comprising an expander, a compressor, a second expander, a pump, a high-temperature heat exchanger, a condenser, an evaporator and a third expander; wherein the condenser (6) has a liquid refrigerant pipe which passes through a pump (4) and connects the evaporator (7), an evaporator (7) has a vapor channel connects the third expander (11), the expander (11) has a low-pressure vapor channel connected the evaporator (7), a compressor (2) has a vapor channel which passes through a high-temperature heat exchanger (5) and the expander (1), the expander (1) has a low-pressure vapor channel connected the evaporator (7), the evaporator (7) has a low-pressure vapor channel connected the compressor (2) and the second expander (3) respectively, the second expander (3) has a low-pressure vapor channel connected the condenser (6); wherein the high-temperature heat exchanger (5) has the heat source medium channel connected the outside, the condenser (6) has the cooling medium channel connected the outside, the evaporator (7) has the heat source medium channel connected the outside if necessary, the expander (1), the second expander (3) and the third expander (11) connect the second compressor (2) and transmit power, wherein the expander (1), the second expander (3) and the third expander (11) connect the compressor (2) and the pump (4) and transmit power if necessary.
 8. A combined cycle power device comprising an expander, a compressor, a second expander, a pump, a high-temperature heat exchanger, a condenser, an evaporator and a heating unit; wherein the condenser (6) has a liquid refrigerant pipe which passes through a pump (4) and connects the evaporator (7), an evaporator (7) has a vapor channel connects the high-temperature heat exchanger (5), a compressor (2) has a vapor channel connects the high-temperature heat exchanger (5), the high-temperature heat exchanger (5) has a vapor channel connected the expander (1), the expander (1) has a low-pressure vapor channel connected the evaporator (7), an evaporator (7) has a low-pressure vapor channel and connects the heating unit (8), the heating unit (8) has a low-pressure vapor channel and connects the compressor (2) and the second expander (3) respectively, the second expander (3) has a low-pressure vapor channel connected the condenser (6); wherein the high-temperature heat exchanger (5) has the heat source medium channel connected the outside, the condenser (6) has the cooling medium channel connected the outside, the evaporator (7) has the heat source medium channel connected the outside if necessary, the heating unit (8) has the heated medium channel connected the outside, the expander (1) and the second expander (3) connect the second compressor (2) and transmit power, wherein the expander (1) and the second expander (3) connect the compressor (2) and the pump (4) and transmit power if necessary.
 9. A combined cycle power device comprising an expander, a compressor, a second expander, a pump, a high-temperature heat exchanger, a condenser, an evaporator, a second high-temperature heat exchanger and a second compressor; wherein the condenser (6) has a liquid refrigerant pipe which passes through a pump (4) and connects the evaporator (7), an evaporator (7) has a vapor channel connects the high-temperature heat exchanger (5), the compressor (2) has a vapor channel connects the high-temperature heat exchanger (5), the high-temperature heat exchanger (5) has a vapor channel connected the second compressor (12), the second compressor (12) has a vapor channel which passes through a second high-temperature heat exchanger (10) connects the expander (1), the expander (1) has a low-pressure vapor channel connected the evaporator (7), an evaporator (7) has a low-pressure vapor channel and connects the compressor (2) and the second expander (3) respectively, the second expander (3) has a low-pressure vapor channel connected the condenser (6); wherein the high-temperature heat exchanger (5) and the second high-temperature heat exchanger (10) has the heat source medium channel connected the outside respectively, the condenser (6) has the cooling medium channel connected the outside, the evaporator (7) has the heat source medium channel connected the outside if necessary, the expander (1) and the second expander (3) connect the second compressor (2) and the second compressor (12) and transmit power, wherein the expander (1) and the second expander (3) connect the compressor (2), the second compressor (12) and the pump (4) and transmit power if necessary.
 10. A combined cycle power device comprising an expander, a compressor, a second expander, a pump, a high-temperature heat exchanger, a condenser, an evaporator, a second high-temperature heat exchanger and a third expander; wherein the condenser (6) has a liquid refrigerant pipe which passes through a pump (4) and connects the evaporator (7), an evaporator (7) has a vapor channel connects the high-temperature heat exchanger (5), the compressor (2) has a vapor channel connects the high-temperature heat exchanger (5), the high-temperature heat exchanger (5) has a vapor channel connected the third expander (11), the third expander (11) has a vapor channel which passes through a second high-temperature heat exchanger (10) connects the expander (1), the expander (1) has a low-pressure vapor channel connected the evaporator (7), an evaporator (7) has a low-pressure vapor channel and connects the compressor (2) and the second expander (3) respectively, the second expander (3) has a low-pressure vapor channel connected the condenser (6); wherein the high-temperature heat exchanger (5) and the second high-temperature heat exchanger (10) has the heat source medium channel connected the outside respectively, the condenser (6) has the cooling medium channel connected the outside, the evaporator (7) has the heat source medium channel connected the outside if necessary, the expander (1), the second expander (3) and the third expander (11) connect the second compressor (2) and transmit power, wherein the expander (1), the second expander (3) and the third expander (11) connect the compressor (2) and the pump (4) and transmit power if necessary.
 11. A combined cycle power device comprising an expander, a compressor, a second expander, a pump, a high-temperature heat exchanger, a condenser, an evaporator, a high-temperature regenerator, a second high-temperature heat exchanger and a second compressor; wherein the condenser (6) has a liquid refrigerant pipe which passes through a pump (4) and connects the evaporator (7), an evaporator (7) has a vapor channel which passes through the high-temperature regenerator (9) and connects the high-temperature heat exchanger (5), a compressor (2) has a vapor channel which passes through a high-temperature regenerator (9) and the high-temperature heat exchanger (5), the high-temperature heat exchanger (5) has a vapor channel connects the second compressor (12), the second compressor (12) has a liquid refrigerant pipe which passes through second high-temperature heat exchanger (10) and connects the expander (1), the expander (1) has a low-pressure vapor channel which passes through a high-temperature regenerator (9) and connects the evaporator (7), an evaporator (7) has a low-pressure vapor channel and connects the compressor (2) and the second expander (3) respectively, the second expander (3) has a low-pressure vapor channel connected the condenser (6); wherein the high-temperature heat exchanger (5) and the second high-temperature heat exchanger (10) has the heat source medium channel connected the outside respectively, the condenser (6) has the cooling medium channel connected the outside, the evaporator (7) has the heat source medium channel connected the outside if necessary, the expander (1), the second expander (3) connect the compressor (2) and the second compressor (12), transmit power, wherein the expander (1) the second expander (3) and the second expander (3) connect the compressor (2), the second compressor (12) and the pump (4) and transmit power if necessary.
 12. A combined cycle power device comprising an expander, a compressor, a second expander, a pump, a high-temperature heat exchanger, a condenser, an evaporator, a high-temperature regenerator, a second high-temperature heat exchanger and a third expander; wherein the condenser (6) has a liquid refrigerant pipe which passes through a pump (4) and connects the evaporator (7), an evaporator (7) has a vapor channel which passes through the high-temperature regenerator (9) and connects the high-temperature heat exchanger (5), the compressor (2) has a vapor channel which passes through the high-temperature regenerator (9) and connects the high-temperature heat exchanger (5), the high-temperature heat exchanger (5) has a vapor channel and connects the third expander (11), the third expander (11) has a vapor channel which passes through the second high-temperature heat exchanger (10) and connects the third expander (1), the third expander (1) has a low-pressure vapor channel which passes through the second high-temperature regenerator (9) and connects the evaporator (7), an evaporator (7) has a low-pressure vapor channel and connects the compressor (2) and the second expander (3) respectively, the second expander (3) has a low-pressure vapor channel connected the condenser (6); wherein the high-temperature heat exchanger (5) and the second high-temperature heat exchanger (10) have the heat source medium channel connected the outside respectively, the condenser (6) has the cooling medium channel connected the outside, the evaporator (7) has the heat source medium channel connected the outside if necessary, the expander (1), the second expander (3) and the third expander (11) connect the compressor (2) and transmit power, wherein the expander (1) the second expander (3) and the third expander (11) connect the compressor (2) and the pump (4) and transmit power if necessary.
 13. The device according to any one of claim 1-12, wherein adding a low temperature regenerator and the second pump, adjusting that the condenser (6) has a liquid refrigerant pipe which passes through a pump (4) and connects the evaporator (7) to that the condenser (6) has a liquid refrigerant pipe which passes through a pump (4) and connects a low temperature regenerator (13), the compressor (2) adds the vapor extraction channel connected the low temperature regenerator (13), the low temperature regenerator (13) has a liquid refrigerant pipe which passes through the second pump (14) and connects the evaporator (7), a combined cycle power device is formed. 